Are you sure your servo is capable of 180 degree turns?Not every servo goes that far.

Yes, absolutely sure. I have another servo controller (SSC-32 of Lynxmotion) and also I used general servo lib of Arduino, all ok with servos. When I searched the forum I found other post where the writer mentioned of this problem with hs422, but no solution there (it was not the central topic). I think the problem is with the way the init. func. is defined in the TLC lib, but I'm not sure. Hope someone knows it